The Redding Competition Shellholder Kit consists of five shellholders in varying heights with increments of .002". Allows you to increase or decrease the case to chamber headspace without adjusting the dies. Storage box included.Notes:Packaged 5 piece set in .002" increments (+.002", +.004", +0.06", +.008" & +.010")Each shellholder is clearly marked to indicate the amount it will decrease case to chamber headspaceSet allows you to adjust case to chamber headspace of your reloads with a simple shellholder change